I normally play Team Fortress 2 via Steam on Windows 7, but because of the adorable penguin I installed Ubuntu (12.10). I had I hard time installing Steam, but eventually I did it. After that I installed Team Fortress 2, which took a long time but I managed that too. So when I finally wanted to play to get my beloved penguin, I got this error when I wanted to start Steam:

Fatal Error: Steam failed to load: *SteamStartEngine(0xffde5c90) failed with error 1: CMultiFieldBlob(pSerialized) : Patrial field header at end of record